This is all grand and good. However it ignores human nature. We are not robots, we have emotions and yes it's always best to leave the emotions at home and focus on what is strictly business in our work life.
Back when I was in US's good graces I told them point blank, "You'd best be ready for the mess that's going to occur when it comes time to do the next contract (meaning this one) because they (AFA) won't forget the job you did on them and IMO it will get ugly". That was to a Senior VP who was tight With Mr Glass. His response was, "I hear you but we're trying to save the company and we've not time for nice."
Well turns out old SH was right and now here we are some 8 years or so after that conversation and no surprise to me the contract was rejected. Logic, Prudence, Business Acumen etc etc is NOT at play here. What is at play and rightfully so is emotions, passions and the determination to "Show" management a thing or two. I don't blame the F/A's even a little for feeling as they do. In fact I'd go the other way in that I'm amazed they have performed as professionally as they have given the circumstances.
Replace the Negotiating Committee? To what end? That committee is only going to be as effective as the Leadership behind it and sadly there is no leadership. Somebody, Somewhere within the ranks has got to come forward and engage, inspire and rally the group. Changing the negotiating committee IMO is merely rearranging deck chairs on the Titanic.